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Projection angle and image quality loss???

1031 Views 4 Replies 4 Participants Last post by Jason Turk, Jul 25, 2009

JapanDave

Discussion Starter · Jul 24, 2009

I searched but could not find anything, however I am sure this has been asked ,so I will appologise now.

Do projectors lose image quality with an offset projection angle, eg 4 or 5 ft off center? I have two PJ that I am liking the specs of ,but their throw ratio may mean I can't have them dead center. Any help would be appreciated.

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JapanDave

Discussion Starter · #2 · Jul 24, 2009

No body knows??? I should get a prize for asking a question that can't be answered!!!

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Craig Peer

· #3 · Jul 24, 2009

It depends if the projector has horizontal lens shift. I have one that does and being a bit off center doesn't matter. My new projector has no horizontal lens shift and must be mounted dead center.

4' or 5' off center doesn't sound workable for any projector I'm familiar with, if you want the best picture quality!

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erkq

· #4 · Jul 25, 2009

Quote:
Originally Posted by Craig Peer /forum/post/16883867

4' or 5' off center doesn't sound workable for any projector I'm familiar with, if you want the best picture quality!

That is a bit much. But in and of itself that only tells part of the story. The important measure is offset angle. So 4' to 5' off center is really meaningless without knowing throw distance and screen width.

Some projectors, like some RS1's are actually improved by offset. People have use offset to finess convergence issues by taking advantage of the cheaper lens' CA.

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Jason Turk

· #5 · Jul 25, 2009

Quote:
Originally Posted by JapanDave /forum/post/16879010

I searched but could not find anything, however I am sure this has been asked ,so I will appologise now.

Do projectors lose image quality with an offset projection angle, eg 4 or 5 ft off center? I have two PJ that I am liking the specs of ,but their throw ratio may mean I can't have them dead center. Any help would be appreciated.

Horizontal is not recommended because of how it reacts with most screens in part. Remember also extreme lens shift in one direction means much less ability in the opposite plane. All in all, I don't recommend it.

As I recall you were thinking 2.35:1 so if you are adding an outboard lens, more issues.

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